| 摘要 |
PURPOSE:To prevent the occupancy of a radio channel by providing a means switching the state of a radiotelephony equipment from the reception to the transmission state or from the transmission state to the reception state through the on-operation of a press switch and holding the state after switching even when the press switch is turned off on its way. CONSTITUTION:A signal S2 of H level for a short time is outputted from a reset circuit 4, a signal S4 at an output terminal Q goes to L, a radio section 6 is in the reception state, a signal S1 at an output terminal Q goes to H and is set to a data terminal D. In turning on the press switch 1 in this state, a signal S3 goes from H to L, the signal S4 at the output terminal Q goes from L to H and the radio section 6 is in the transmission state. The transmission state of the radio section 6 is kept even when the press switch 1 is turned off, and when the press switch 1 turned from OFF to ON, the signal S1 at L level at the output terminal Q is sent to the output terminal Q by the signal S4 at L level and the radio section 6 is switched into the reception state. Thus, the undesired occupancy over a long time of the radio channel is prevented. |
